I was mulling over photo licenses a few minutes ago. Currently my photos on flickr are 'all rights reserved' as default. This is because I often have photos of Toby or other small children that I don't want to allow rights to (and I know this doesn't stop anyone downloading them and using them but it means should they do so and get caught they can make no argument that they had the right in law). However, a good percentage of my photos would be fine under CC license.
The only way I could alter this (apart from each image individually) would be by changing them all as a batch to a default other license, and then searching for all photos tagged with toby (or whatever) and changing those back, which is something of a faff. It occured to me it would be great if you could override your default license if you used a tag. Not just be able to tag 'CC' or whatever but if my photos were a CC license unless I used the tag 'tobyab' or 'toby' in which case they would be 'all rights reserved'.
Does that make sense?